Cross
Cross  
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Pattern type  Oscillator  

Number of cells  28  
Bounding box  10 × 10  
Period  3 (mod: 3)  
Heat  26.7  
Volatility  0.83  0.83  
Kinetic symmetry  *k  
Discovered by  Robert Wainwright  
Year of discovery  1989  
 
 
 

Cross is a period3 oscillator that was found in October 1989 by Robert Wainwright.^{[1]}
In August 2004 Jason Summers found a 16glider synthesis of this oscillator.^{[2]}
According to Catagolue, it is the fiftyseventh most common object in even 8fold symmetry (D8_4), occurring in 1 in 4600 soups.
Extensions
Cross is the smallest in an infinite family of period 3 oscillators, the next of which is cross 2. The fact that this infinite family of oscillators exists shows that there are an infinite number of oscillators that are polyominoes in at least one of their phases.
An alternate form of extension can be derived from the fact that one of its phases involves four detached segments. Two other oscillators, the pulsar and bracket pulsar, visually resemble this phase, and the cross can be extended in much the same way as these other oscillators can.

Four partial copies of the star can mutually stabilise partial copies of the cross joining them to form a larger loopshaped period3 oscillator, as appeared in a D8_4 soup submitted to Catagolue by Charity Engine on 20221112.
starcross weld hybrid (click above to open LifeViewer) Catagolue: here 
See also
 Star
 Bent keys, odd keys, and short keys, which have the same edge behaviour
References
External links
 Cross at the Life Lexicon
 Cross at Adam P. Goucher's Catagolue
 Patterns
 Oscillators with 28 cells
 Periodic objects with minimum population 28
 Patterns with 28 cells
 Patterns found by Robert Wainwright
 Patterns found in 1989
 Patterns that can be constructed with 12 gliders
 Oscillators
 Oscillators with period 3
 Oscillators with mod 3
 Oscillators with heat 26
 Oscillators with volatility 0.83
 Oscillators with strict volatility 0.83
 Oscillators with *k symmetry
 Seminatural periodic objects
 Sparkers
 Sparkers with period 3
 Weak sparkers
 Polyominoes
 Extendable oscillators